将水淬、空冷方式热处理的X80钢与供货状态(原始组织)X80钢相比较,用动电位极化曲线和动电位交流阻抗谱研究不同组织X80钢在0.5 mol/L Na_2CO_3+1 mol/L NaHCO_3高pH值土壤模拟溶液中的点蚀电化学行为.结果表明,水淬热处理后的X80钢更易钝化,点蚀敏感性低,但维钝电流较其他两种组织的都大;三种组织的X80钢极化电阻和电极表面状态常数n值随电位的变化规律基本一致,但水淬组织的n值在不同电位区间分别高于或低于其他两种组织;这些电化学行为的差异与不同组织试样表面钝化膜的非均匀性和致密程度有关;动电位极化法和动电位电化学阻抗谱法所得结论一致,腐蚀电流密度随电位的变化及电极极化电阻随电位变化都可用来反映电极的点蚀行为.
The different microstructure of X80 steel was obtained by heat treatment,water quenching and air cooling.The pitting electrochemical behavior of X80 pipeline steel with three different microstructure in 0.5 mol/L Na_2CO_3+1 mol/L NaHCO_3 high pH soil simulative solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy.The results indicated that the corrosion inhibition of X80 steel after heat treatment became worse compared with original microstructure,but passivated easily;the law of R_p and n of three microstructures steel varying with potential is same,and n is bigger or lower in different potential ranges;the difference of microstructure caused by heat treament and the uniformity of passive films should be responsible to the different electrochemical behavior.The conclusion from potentiodynamic polarization curve is the same to the conclusion reached by electrochemical impedance spectroscopy.
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